Pressure Equation

Volume:
Temperature:

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Marsenne Cabral 1A
Posts: 59
Joined: Fri Sep 28, 2018 12:19 am

Pressure Equation

Postby Marsenne Cabral 1A » Sat Feb 16, 2019 9:36 pm

When would you use the -nRTln(P1/P2) equation?

Henry_Phan_4L
Posts: 68
Joined: Fri Sep 28, 2018 12:24 am

Re: Pressure Equation

Postby Henry_Phan_4L » Sat Feb 16, 2019 10:40 pm

Use it when they give you a change in pressure that isn't from a volume change. For example they would say that a cylinder is filled with an ideal gas which increases its pressure from 1 to 10 atm.

Michael Torres 4I
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Joined: Thu May 10, 2018 3:00 am
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Re: Pressure Equation

Postby Michael Torres 4I » Sat Feb 16, 2019 11:38 pm

This equation would be most applicable when calculating the change in entropy from a pressure change.

Yvonne Du
Posts: 64
Joined: Fri Sep 28, 2018 12:23 am

Re: Pressure Equation

Postby Yvonne Du » Sat Feb 16, 2019 11:40 pm

When the temperature is constant, you can either use V2/V1 or P1/P2 depends on what you are given because in the formula PV=nRT, P and V has a proportional relationship.

Niveda_B_3I
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

Re: Pressure Equation

Postby Niveda_B_3I » Tue Feb 19, 2019 12:39 pm

When you are calculating an entropy change due to pressure, and not volume.

Kirsty Star 2H
Posts: 48
Joined: Fri Sep 28, 2018 12:24 am

Re: Pressure Equation

Postby Kirsty Star 2H » Tue Feb 19, 2019 4:42 pm

This equation is exactly the same if it were (v2/v1) since from the ideal gas law pv=nRT, you know that pressure and volume are inversely proportional. it just depends what the problem gives you

Shreya_Bharadwaj_1D
Posts: 38
Joined: Fri Sep 28, 2018 12:22 am

Re: Pressure Equation

Postby Shreya_Bharadwaj_1D » Tue Feb 19, 2019 9:58 pm

When calculating change in entropy given constant Temperature, moles, and volume

Jacqueline Duong 1H
Posts: 61
Joined: Fri Sep 28, 2018 12:28 am

Re: Pressure Equation

Postby Jacqueline Duong 1H » Sun Mar 17, 2019 5:26 am

You would use that equation when there is a change in pressure.


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